第四，利用闭凸包收缩原理和特征空间分离度量方法对决策树多类分类算法进行了改进。
Via abstracting this pre-information, the blindness of choosing the classifier can be reduced and existing method of multi-classification can be advanced to improve their accuracy of classification.
本论文以凸体为研究对象，主要涉及两个方面的内容：平面凸集的凸包为闭集的充分必要条件；
The paper is concerned with two aspects:A necessary and sufficient condition for convex hull of a set in E2 being closed;
本论文以凸体为研究对象，主要涉及两个方面的内容：平面凸集的凸包为闭集的充分必要条件；
The paper is concerned with two aspects:A necessary and sufficient condition for convex hull of a set in E2 being closed;
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